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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: AssignmentExprParser.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.expr;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.parse.ParseSession;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>/**<a name="line.12"></a>
<span class="sourceLineNo">013</span> * Parses Java assignment expressions of the form {@code x = y}, {@code x += y}, etc.<a name="line.13"></a>
<span class="sourceLineNo">014</span> */<a name="line.14"></a>
<span class="sourceLineNo">015</span>public class AssignmentExprParser extends BinaryExprParser {<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>    public static final AssignmentExprParser INSTANCE = new AssignmentExprParser();<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>    public AssignmentExprParser() {<a name="line.19"></a>
<span class="sourceLineNo">020</span>        super(ConditionalParser.INSTANCE, false, Op.EQUALS, Op.PLUS_EQUALS, Op.MINUS_EQUALS, Op.MULTIPLY_EQUALS,<a name="line.20"></a>
<span class="sourceLineNo">021</span>          Op.DIVIDE_EQUALS, Op.MODULO_EQUALS, Op.AND_EQUALS, Op.XOR_EQUALS, Op.OR_EQUALS, Op.LSHIFT_EQUALS,<a name="line.21"></a>
<span class="sourceLineNo">022</span>          Op.RSHIFT_EQUALS, Op.URSHIFT_EQUALS);<a name="line.22"></a>
<span class="sourceLineNo">023</span>    }<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    @Override<a name="line.25"></a>
<span class="sourceLineNo">026</span>    protected Node createNode(final Op op, final Node lhs, final Node rhs) {<a name="line.26"></a>
<span class="sourceLineNo">027</span>        return new Node() {<a name="line.27"></a>
<span class="sourceLineNo">028</span>            @Override<a name="line.28"></a>
<span class="sourceLineNo">029</span>            public Value evaluate(ParseSession session) {<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>                // Get left-hand value, which must be an LValue<a name="line.31"></a>
<span class="sourceLineNo">032</span>                final LValue lvalue = lhs.evaluate(session).asLValue("assignment");<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>                // Calculate new value<a name="line.34"></a>
<span class="sourceLineNo">035</span>                Value value = rhs.evaluate(session);<a name="line.35"></a>
<span class="sourceLineNo">036</span>                if (op != Op.EQUALS)<a name="line.36"></a>
<span class="sourceLineNo">037</span>                    value = Op.forSymbol(op.getSymbol().replaceAll("=", "")).apply(session, lvalue, value);<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>                // Assign new value to lvalue<a name="line.39"></a>
<span class="sourceLineNo">040</span>                lvalue.set(session, value);<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>                // Done<a name="line.42"></a>
<span class="sourceLineNo">043</span>                return value;<a name="line.43"></a>
<span class="sourceLineNo">044</span>            }<a name="line.44"></a>
<span class="sourceLineNo">045</span>        };<a name="line.45"></a>
<span class="sourceLineNo">046</span>    }<a name="line.46"></a>
<span class="sourceLineNo">047</span>}<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>




























































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